The ABB 2TLA020070R2100 idfix-rw is an essential identifier circuit designed for seamless integration with the Pluto safety bus system. This read/write device allows for the assignment of unique addresses to each connected Pluto, ensuring precise communication and operation within your safety network. The IDFIX number is fully programmable, granting users the flexibility to select their desired address. In multi-Pluto projects, the IDFIX is indispensable, providing each Pluto with a distinct identification code that is recognized by the system and declared in the PLC program. This ensures that the correct segment of the PLC program is executed by each specific Pluto. Additionally, the IDFIX facilitates the replacement of Plutos in a multi-unit setup by allowing a new Pluto to self-load the PLC program from an existing unit on the bus, while maintaining the correct address. For single-unit operations, the use of IDFIX is optional, but it remains a valuable tool for maintaining system integrity and efficiency.